Event.observe(window, 'load',function() { 
	var searchStr = 'span.dev';
	var results = $$(searchStr);
	results.each(function(elem){
		elem.hide();
	});
	$('dev0').show();
});

var devc=1;		
function dev(){
	var searchStr = 'span.dev';
	var results = $$(searchStr);
	results.each(function(elem){
		elem.hide();
	});
	if(devc<cdev){
		$('dev'+devc).show();
		devc++;
	}else{
		$('dev0').show();
		devc=1;
	}
};